Hello,
there is a little problem with naming convention, as lablGL is maybe the only ocaml package with capital letters. Because of this, in debian, opam, mxe, and in many other package manager or distributions, they use "lablgl", but for compatibility purposes also use lablGL. Which makes things not easy for everyone.

Could it be possible to make the update to lablgl instead of lablGL ? you only need to rename the installation folder from lablGL to lablgl...

Also, for similar purposes, many distributions need to add a META file to add ocamlfind support. But as it is not done upstream, they could choose different naming conventions, and so making incompatibilities between distributions... To solve this, just adding a "META.ex" file would help people find some kind of consensus.